Furnace.



No. 680,52I. Patented Aug. [3, I90l. A. L. FDY.

FURNACE.

(Application filed May 16, 1901.)

(No Model.)

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UNITED STATES PATENT OFFICE.

ALPIIONSE L. FOY, OF BROOKLYN, NEW YORK.

FURNACE.

SPECIFICATION formingpart of Letters Patent No. 680,521, dated August13, 1901.

Application filed May 16, 1901. Serial No. 60,491. (No model.)

To all whom, it may concern:

Be it known that I, ALPHONSE L. For, a citizen of the United States, anda resident of New York, borough ofBrooklyn,in the county of Kings andState of New York, have made and invented certain new and usefulImprovements in Furnaces, of which the following is a specification.

My invent-ion relates to an improvement in boiler-furnaces, and moreparticularly to means for supplying air to the fire-bed for the purposeof increasing and perfecting the combustion of the coal and gases. Manydevices have been constructed for this purpose, the one most generallyused being the steam-jet blower, and while an increased supply of air isafforded thereby, yet it is always open to the objection that by reasonof the moisture in the steam the boiler is corroded and injured.

One object of my invention is to supply to the fire an increased supplyof heated and dried air, not only under the fire-bed, but also above it,whereby the gases in many cases escaping through the fiues will beentirely consumed.

A further object of my invention is to provide means whereby the air maybe directed to all parts of the fire-bedthat is, along its sides and atthe rear-so that the fire may be kept bright and even, and also toprovide means whereby the quantity of air directed to either side or atthe rear and also above and below the fire-bed may be nicely regulated;and with these and other ends in view the invention consists in certainnovel features of construction and combinations of parts, as will behereinafter fully described, and pointed out in the claim.

In the accompanying drawings, Figure 1 is a view in side elevation of aboiler-furnace, a portion of the wall being broken away for the purposeof illustrating the air-fiues. Fig. 2 is a sectional view taken on theline 2 2 of Fig. 1, and Fig. 3 a similar View taken on the line 3 8 ofFig. 1.

Referring to the drawings, A 13 represent the two side walls of thefurnace, O the rear wall, and D the transverse or bridge wall, usuallyconstructed of brick and inclosing a boiler E of any desired kind orcharacter, and forward of which is a grate F. In these side walls AB areformed the main flues a a, comformed the branch fiues or air-passagescf,

the former at a height above the grate and the latter below the grate,the three fiues or passages e, a, and fcom mu nicating with each otherby means of the vertical flue or passage d, into which the forward endsof said fiues lead. In the opposite side wall B are also formedcorresponding fiues or passages ef, which are also of a length equal tothe depth of the grate F, the former at a height above the grate and thelatter below the grate, the three passages or fiues e a f communicatingat their forward ends by means of the vertical passage 61, into whichsaid three passages or fiues lead.

In the bridge-wall D is formed a passage 0, communicating with the rearends of the fiues e e, and also the flue c, communicating with the rearends of the fiues ff, this construction and arrangement resulting in theformation of practically two fiues, one above the grate and the otherbelow the grate and eX- tending along one side of the latter, then backof said grate, and then around the opposite side of said grate, whichtwo fiues communicate with each other by reason of the said verticalfiues and also with the fiues a a, which extend the entire length of thetwo walls A 13.

From the passages e e, ff, and c 0 lead openings 2' into thefire-chamber and ash-pit, or, in other words, at points above and belowthe grate F, for the purpose of directing the air from said passagesabove and below the fire-bed, as hereinafter described. In the verticalpassage d I place sliding dampers k, and in the vertical passage d Iplace the sliding dampers 70, whereby communication of the branch orshort horizontal fiues e e and f f may be out oif from the main fiues aa.

Having fully described the construction IOC and arrangement of my newdevice, I will now describe the operation thereof: Air is forced throughthe main fines a a, and by reason of its travel along the side wallsinclosing the boiler E it is heated and dried. If all the dampers beopen, the air passes into the vertical fines d d and then through thebranch fines e e, ff, and c c" and through the holes or openings 1'above the fire-bed, supplying a snfficient amount of oxygen to cause thegases above the fire-bed to be consumed and also a snfiicient amount ofair below the fire-bed to materially increase the draft through thesame. By locating the passages as above described a current of air issupplied both above and below the fire-bed and at the two sides and rearthereo i, the ad van tage of which will be immediately apparent to thoseskilled in the art. If it be desired to supply air below the fire-bedsonly, the upper dampers 70 7c are pulled outwardly, thereby shutting offcommunication of the branch passages e e c with the main fi ues a a,thereby directing all the air from said fines a adown into the fines ff0' and from there into the ash-pit under the grate F. If, on the otherhand, it becomes necessary to supply the air to and over the largely toone side of the bed and but little to the opposite side, the arrangementof dampers and fines permitting the fire-bed to be kept even and brightby properly adjusting said dampers.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is

In a furnace, the combination with the side walls having horizontal mainair-passages formed therein, and extending the length of said walls, andwith vertical air-passages at the forward ends of said main passages,and communicating therewith, of a grate located in the forward end ofsaid walls, auxiliary fines located in said side walls above and belowsaid main fines and above and below said grate, the forward ends of saidauxiliary fines communicating with said vertical fines or passages, abridge-wall connecting said side walls, and having fines therein aboveand below said grate and communicating with the rear ends of saidauxiliary fines, and dampers located in said vertical fines whereby anyor all of the air passing through the main fines may be directed aboveor below said grate, substantially as described.

Signed at New York, in the county of New York and State of New York,this 14th day of May, A. D. 1901.

ALPHONSE L. FOY.

\Vitnessesi GEORGE 000K, M. VAN NORTWICIL

